Year	Number
2007-01-01	457187
2008-01-01	1661514
2009-01-01	2225062
2010-01-01	1916413
2011-01-01	1428249
2012-01-01	1249485
2013-01-01	623207
2014-01-01	485989
2015-01-01	357237
2016-01-01	504633
2017-01-01	500763